Go is like the Six Million Dollar Man language, compared to C. It's everything C can do, but much better.

Both C and Go are very, very simple languages; there aren't many keywords, and it's pretty easy to grok both at a functional level. It takes, of course, a bit to reach the second-level understanding you need to make full use of either language, but it's easy to hit the ground running in both.

We sometimes get stuck on one language being better than others because it has X feature or Y concept, and I've seen some people essentially root for one language over another. But at the end of the day, languages are tools to get your work done, and on balance the work is going to be hard whichever route you go. Use the one that suits the talents you have available and that broadly complements the needs that you have.